Solids of Revolution - IB Math HL

Equations of Circles:    • Equations of Circles   Cutting an orange:    • The weirdest way to cut an orange   00:00 - Intro 01:33 - Circumferece and Circle Area 04:35 - 3 different proofs 12:47 - Trigonometric Substitution 17:41 - Volume of a Sphere 19:23 - A bad way to cut the sphere 19:58 - A sphere as a stack of circles 25:13 - A sphere as layered cylindrical shells 32:23 - A sphere as layers of hollow spheres 34:54 - Length of a curve 38:32 - Surface area of a sphere gone wrong 41:47 - Surface area correctly